A novel and inexpensive digital system for eye movement recordings using magnetic scleral search coils

Karin Eibenberger, Bernhard Eibenberger, Dale Roberts, Thomas Haslwanter, John Carey

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


After their introduction by Robinson (IEEE Trans Biomed Eng 10:137–145, 1963), magnetic scleral search coils quickly became an accepted standard for precise eye movement recordings. While other techniques such as video-oculography or electro-oculography may be more suitable for routine applications, search coils still provide the best low-noise and low-drift characteristics paired with the highest temporal and spatial resolution. The problem with search coils is that many research laboratories still have their large and expensive coil systems installed and are acquiring eye movement data with old, analog technology. Typically, the number of recording channels is limited and modifications to an existing search coil system can be difficult. We propose a system that allows to retro-fit an existing analog search coil system to become a digital recording system. The system includes digital data acquisition boards and a reference coil as the hardware part, receiver software, and a new calibration method. The circuit design has been kept simple and robust, and the proposed software calibration allows the calibration of a single coil within a few seconds.

Original languageEnglish
Pages (from-to)421-430
Number of pages10
JournalMedical and Biological Engineering and Computing
Issue number2-3
Publication statusPublished - 1 Mar 2016


  • Biomedical electronics
  • Biomedical signal processing
  • Eye movement
  • Head impulse test
  • Search coil
  • Eye Movements/physiology
  • Magnetic Phenomena
  • Humans
  • Signal Processing, Computer-Assisted
  • Adult
  • Video Recording/economics


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